Yes, one polymer commonly used in drilling fluid formulations is CMC (hydroxyethyl cellulose or hydroxypropyl cellulose carboxymethyl ester). CMC has good water solubility and gelling properties and is often used to thicken and regulate the rheological properties of drilling fluids. It can be used as a fluid control agent to adjust the viscosity of drilling fluids, control fluid loss and improve liquid phase properties. CMC has a wide range of applications in drilling processes. 😊👍